<form class="form" method="post">
  <fieldset>
    <legend>用户注册</legend>
    <div class="form-group">
      <label class="control-label" for="username">用户名</label>
      <input type="text" class="form-control" id="username" name="username">
      <p class="help-block">你的账户名称，用于登录和显示。</p>
    </div>
    <div class="form-group">
      <label class="control-label" for="password">口令</label>
      <input type="password" class="form-control" id="password" name="password">
    </div>
    <div class="form-group">
      <label class="control-label" for="password-repeat">重复输入口令</label>
      <input type="password" class="form-control" id="password-repeat" name="password-repeat">
    </div>
    <div class="form-actions">
      <button type="submit" class="btn btn-primary">注册</button>
    </div>
  </fieldset>
</form>